There is a layer of asphalt sound deadening material adheared to the metal floor.

Want your Benz to last another 25 years? Remove the Asphalt from the floors.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine